Brooklyn



(No Model.)

l R. MCMANUS. CARBON FOR ELECTRIC ARC LAMPS.

No. 504.845. Patented Sept. l2, 1893.

electric arc lamp or similarvessel.

twin reins Bernier unioni lRBERT MCMANUS, OF NE'VV YORK, ASSIGNOR TO VVILTJAM A. POWELL, OF

BROOKLYN, NEW Yoan.

CARBON .FOR LCTRICWQRC LAMPS.

SPECIFICATION forming part of I etters Patent No. 504,845, dated September 12, 1893. Application iiled July 8, 1892. Serial No. 439,438. (No model.)

To au whom, it may concern:

Be it known that ROBERT MCMANUS, of the city of Brooklyn, in the county of Kings and State of New York, have Ainvented a new and useful Improvement in the Manufacture of Carbone for Electrical Lighting and Heating Purposes; and l do h ereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same.

This invention relates to carbone tobe used in electric lightingandheating The object ot my invention is-to supply a carbon pencil or electrode to be used in any In the accompanying drawings Figure 1` is an elevation, partly broken -away and lpartly in sectiou,of apenoil or electrode madein accordance with my invention;v andFig. 2 is a transverse section of Fig. 1.y i

My carbon pencil or'electrode is made by combining a volatile carbon made from minera-l Oils, their productsor equivalents, with finely pulverized coke and a proportion 'of iron. The proportions of these ingredients which I have found most beneficial are ninety-two (92) parts of coke, seven (7) parts of mineral Oil, one .(1) part of iron, but I do not confine myself to these proportions.

In preparing my composition I lirst take a quantity of selected coke made from coal or petroleum previously pulverized and carefully washed to remove foreign substances, and then mix the ingredients to a paste of about the consistency of ordinary painters putty. The mixture is then pnt into a press and forced under the necessary pressure through a die or `mold of the size to be given to the pencil or electrode. The carbone thus formed are cut oli at the desired length, and placed in molds. These molds are then placed in an oven for several hours to dry, and are then kept at the desired heat for tenor twelve hours to recarbonize. treated in -a beth with a solution of perchloride of iron, and then electroplated with iron.

' The pencil or electrode is then ready for use.

Acarhon pencil or electrode made in accordance with my invention. will vburn from fourto eight hours longer than any other heretofore employed, and the iron coating used by me is much less expensive than the copper coating heretofore need in such manutactures, andisinoredurable. The result of my carbon-pencil is a pure white light in- 55 stead of ai blue light given out'by other carbons.

What l claim asini-y invention, and desire to secure by Letters Patent, is 'l .1. The combinat'on of coke, mineral oil and 6o iron to form .pencils or electrodes.

2. A carbonv pencil or'electrode consisting of a composition of coke and mineral oil coated with iron. Y

3. A carbon pencil or. electrode consisting 65 of a composition of coke,mineral oil and iron coated with iron. A y v .ROBERT MCMAA'NUS.

Witnesses: V

JAMES C. CLOYD, LUCIEN S. BAYLIss.-

These carbonsare then f 

